Transformer for electric currents.



G. LE G. PORTESGUE.

TRANSPORMER POR- ELECTRIC GURRENTS.

APPLICATION FILED 00T. 8, 1910. RENBWBD AUG. zo, 1914.

1,129,473. Patented Feb. 23, 1915.

2 SHEETS-SHEET 1.

ATTORNEY C. LE G. FORTESGUE.

TRANSFORMER FOR ELECTRIC CURRENTS.

APPLICATION FILED 00T. 8, 1910. RBNBWED AUG. zo, 1914.

Patented Feb. 23,

2 SHEETS-SHEET 2.

WITNESSES:

CHARLES LE G. Fonrnscun, or PITTSBURGH, PENNSYLVANIA, AssreNon, ro wasfr- INGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION 0F PENNSYLVANIA.

TRN'SFORMER FOR ELECTRIC CURRENTS.

Patented Feb.. 23, 1915..

Original applicaon le August 2, 1909, Serial No. 510,854. llivicledl and this application nled October 3,

` 1910, Serial No. 586,098. Renewed August 20, 1914. Serial No. 857,773.

To all whom it may concern Be it lmown that li, CHARLES Ln G. Fonrnscnn, a subject of the King of Great Britain, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful 1mprovement in Transformers for Electric Currents, of which the following is a specification, this application being a division of application Serial No. 510,854, filed August My invention relates to the windings and insulation of transformers which are A,adapted for use with very high-voltage circuits and it has for its object to provide a winding which is so connected a'nd insulation which is so constructed and associated with the winding, that the manufacturing cost of the transformer and the space occupied by it may be materially reduced, while, at the same time, its terminal voltage may be very high.

' ln my co-pending application, Serial No. fw 510,854, led August 2, 1909, of which this application is a division, l have shown and described various adaptations of insulation, composed of both insulating and conducting materials, for use with the windings of highpotential transformers.

I now desire to claim specifically one modilication which is set forth and claimed broadly in said application, according to which condenser type insulation is employed, the various condenser plates being connected through resistance connections, to such points in the transformer winding -as to properly fix their potential, o1" some other means being provided for preventing disturbances'in the winding which arise from 40 its connection to the condensers.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is a sectional elevation of' a core and windings constructed and connected in accordance therewith, and Fig. 2 is a perspective 'view of a modified structure which also embodies my invention.

Referring to Fig. 1 of the drawings, the structure here illustratedV comprises a substantially rectangular core member/1, a' lowpotential winding 2 that is divided into two groups of coils which sulrround two opposite legs 3 and 4 of the core member 1 and are separated therefrom by insulating sleeves 5,

ahigh-potential winding composed of two groups 6 'and 7 of relatively flat coils, insulating sleeves 8*.and 9 which surround the respective core legs, between the low and the high-potential windings, and insulating barriers 10 and 11 that separate the high-potential windings from each other and from the walls of a tank or casing (not shown) in which the transformer is disposed. rlhe core legs 3 and 4 may be of any suitable form but are preferably cruciform in cross section in order to economize space and to reduce the mean length of turn in the coils.

rEhe conducting cylinders which the insulating barriers 10 and 11 contain, are severally connected toP intermediate points in the transformer windings 6 and 7 through resistors 12.' The connections between coils` are completed through conducting strips 13, which are,A either embedded in insulating sleeves 8 and 9, as shown, or may be disposed between concentric insulating cylinders. By connecting the intermediate points of the winding to the conducting cylinders of the insulating barriers, through resistances, the thickness of the barriers may be materially reduced, since an advantageous distribution of potential through the insulation may be maintained without danger of injuring the insulation immediately surrounding the coils, voltage disturbances produced in the plates of the condenser being choked out by the resistances.

The circuit connections between coils are o such as to facilitate the use` of taps or connections such as those constituted by the resistors 12 between intermediate points in the winding and the condenserl plates of the insulating barriers. Assuming that terminals ,15 and 16 are connected to a high-potential circuit and `that the middle point of the winding is grounded, a circuit is established from the coil 17, through coils 19 to 48, inclusive, as' indicated.

In Fig. 2, the conducting cylinders of the C insulating barriers are provided' with yslots 14 which are cut alternately from opposite edges .in order to form zig-zag paths for the capacity currents, thereby introducing a resistance which is non-inductive and which tends to prevent static disturbances, substantially as the external resistances 12 of Fig. 1 tend to prevent such disturbances.

The arrangement of coils and the struc- Lef.

ture may be modified withinth'e spirit-'and scope of my invention. 1 I claim as my invention; l. 'A transformer comprising a core'member, a plurality of coils dis osed thereon end eeve for separatfr e between adjacent coils,- and other connecto end, and an insulating s mg the co1ls from the c'ore vand comprising a set of non-conducting cylinders and a set: of-alternately disposed conductors, said coils being directly connected 'into groups offtwo adjacent coils each. and saidgroups being connected together by means of lsaid 'ecnductors to constitute 'a series arrangement from the middle coil groups outwardly' to the end groups. A

2. In electric.apparatus,.the combination with a low-potential body and a winding, of

l in the winding.

an insulating structure comprising alter-' nate layers ofinsulatmg vand conducting materials, interposed between said body and said winding and a plurality of resistances through which the conducting layers of the insulation are joined to'fintermediate points 3. In a transformer, the combination with la substantiallrectangular core member and two-groups o coils located on the respective opposite core legs, of insulating` structures separating the two groups from each 'other and comprising concentrlc alternating layers ofv insulating and vconducting materials and high-resistance connections between the con-' v, ducting cylinders and intermediate points in the transformer windings.A L

4. An electrical device com rising a lowpotential body, a'f highfpotentlal conductor,

and an insulating structure interposed bef tween the said body and said conductor land comprising conductors embedded in insulating material,L said embedded conductors ,hav-

v ing relvely high4 resistance 'te limit' capacityncurrents therein. 5.

A ing materials, said 'conducting cylinders be a transformer, the combinatioii with f a magnetizable core member, and a winding therefor, of an insulating structuredisposed between saidcore member and said winding and comprising a plurality 'of alternate cncentric cylinders of insulating andconductingr provided' with slots cut alternately` from i opposite edges to provide a zig-zag path for the capacity currents vinducedA therein and being connected to intermediate points in' the transformer winding. v

6' I electric apparatus', the-,cambiamenwith a. IOW-potentialbody and a highpotem.

tial conductor, of an insulating structure disposed between said body and said conduct'or vand. comprising a plurality of alternate layers of insulatingfand conducting materials and' the conducting-layersbeing slotted to reduce the capacity currents therein. 7 'In anA electrical device, the combination comprising spaced conductors, connections tions between'non-adj acent coils respectively including said conductors.

8. In an electrical devicethe combination with'a plurality of side-byside coils that are connected in a series beginning with the ccnwith a plurality of side-by-side coils, of an I `1nsulating structure adjacent to the coils trally located coils and successively includ- I ing the next outermost coils, an insulating structure adjacent to the coils comprisingspaced conductors, the connections between vnon-adjacent coils including said conductors.

ture, and high resis ance connections between the coils and the conducting layers of the outer structure.

10. In an .electrical device, the combinai -tion with aplurality of side-'bylside coils, of

insulating structures respectively within and without the coils, each compising-alternate vlayers of insulating and conducting materials,connectionsbetween the coils including the conducting layers of one of the insulating structures, and high resistance connectionsbetween the coils and the conduct ing. layers of the other insul'atin structure.

11. In a'n-electrical device, t 'e combination with two groups of side-by-side coils, of insulating structures respectively within the two groups of coils, 4.and other insulating structuresv respectively outside the two groups of coils andseparating lthe same from each other, each offsaid insulating structures comprising alternate .la ers of insulating and conducting materia s, connections between thecoils of each group including the conducting layers of the corresponding inner insulating structures, Aand high resistance connections between the coils of each group andthe conducting layers of the i corresponding outer insulating structures."

In testimony; whereof, I havehe'reunto subscribed my name this 23rdday of Sept., 1910. a r

B. gums.

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